Terms of Service

These terms govern your use of the negotiate.v1 stack operated by Pier39:

• The proxy API at negotiate.pier39.ai
• The hosted MCP endpoint at mcp.pier39.ai
• The negotiate-mcp Python package when installed locally in an MCP-aware client
• The Atlas reference store at negotiate.pier39.ai/store and any other Pier39-operated negotiate.v1 store (the *-demo subdomains)
• Any AI shopper agent (such as the Pier39 Custom GPT) that talks to the above on your behalf

By using any of these, you agree to these terms.

Effective date: May 2026 · Last updated: May 2026

1. The service

Pier39 operates infrastructure that lets AI shopping agents discover and negotiate with online stores via the open negotiate.v1 protocol. The protocol, the connector, and Pier39's reference stores are open source under the MIT license.

You may use the service to:

• Run a shopper agent that negotiates at compliant stores via the connector
• Run a merchant store that accepts agent-driven negotiations via the protocol
• Browse the public store directory or interact with Pier39-operated reference stores

2. Eligibility

You must be at least 13 years old to use the service. The service is not directed at children under 13.

You may use the service for personal or commercial purposes, subject to the acceptable-use policy below.

3. Acceptable use

When using the service, you agree NOT to:

• Send abusive, spammy, or excessively high-volume traffic intended to overload the proxy or any merchant endpoint. Per-IP rate limits apply (60 requests / minute on the hosted MCP endpoint, with a 10-token burst).
• Use the service to discover or exploit vulnerabilities in third-party merchant stores.
• Misrepresent yourself or your AI agent's identity in negotiations (e.g., claiming false authority, impersonating another party, or fabricating context to manipulate pricing).
• Use the service for illegal purposes, including coordinated price manipulation, deceptive trade practices, or violation of consumer protection laws in your jurisdiction.
• Reverse-engineer or attempt to extract data from Pier39's proxy beyond what the public negotiate.v1 protocol exposes.
• Submit requests on behalf of others without their authorization.
• Attempt to circumvent rate limits, security controls, or access restrictions.

Pier39 may rate-limit, suspend, or block traffic that violates these rules.

4. Negotiations and outcomes

Agreements reached during a negotiation are between you (or your shopper agent) and the merchant operating the store. Pier39 is not a party to those agreements.

Pier39 does not guarantee:

• That any specific negotiation will succeed
• That any specific price, discount, or bundle will be offered
• That a merchant will honor an offer made by their agent (though the protocol is designed for them to)
• The accuracy of any product information returned by a merchant
• The continued availability of any store listed in the public directory

When you negotiate at a third-party (non-Pier39) store, that store's own terms of service apply alongside these. Treat each negotiate.v1 store as a separate party — the protocol creates the conversation channel; it doesn't standardize their commercial terms.

5. Payments

Pier39 does not process payments. When a negotiation closes, the merchant's storefront returns a cart or checkout URL; you complete the purchase using your normal payment method on the merchant's site under the merchant's own terms.

Pier39 never holds your funds, never sees your payment details, and never issues refunds. Disputes over orders, refunds, returns, or product quality are between you and the merchant. Pier39 may help reach the merchant on your behalf as a courtesy, but is not obligated to mediate.

6. Intellectual property

The negotiate.v1 protocol specification is open source under the MIT license. The negotiate-mcp Python package is open source under the MIT license. Pier39's reference store implementations are open source under the MIT license. You may use, modify, and distribute these under the terms of that license.

Merchant catalog content (product names, descriptions, prices, images) belongs to the respective merchant. Pier39 does not claim rights to merchant content and you should not assume any.

The Pier39 name, logo, and brand assets remain the property of Pier39. Reasonable nominative use ("works with Pier39 Negotiate") is fine; use that suggests endorsement or affiliation requires written permission.

7. Privacy

Your use of the service is governed by our Privacy Policy at https://negotiate.pier39.ai/privacy, which describes what data we collect, how we use it, and how to delete or opt out.

8. Service changes

Pier39 may modify, suspend, or discontinue any part of the service at any time. We try to give reasonable notice for material changes — via GitHub release notes for the negotiate-mcp package and via the changelog at the top of this page — but we do not guarantee uptime, persistence, or backwards compatibility.

9. No warranty

The service is provided "as is" and "as available" without warranties of any kind, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy, non-infringement, or quiet enjoyment. Pier39 does not warrant that the service will be uninterrupted, error-free, or free from harmful components.

10. Limitation of liability

To the maximum extent permitted by law, Pier39 will not be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of profits, revenues, savings, or data, whether incurred directly or indirectly, arising from your use of the service.

In any case, Pier39's total cumulative liability for any claims relating to the service will not exceed one hundred U.S. dollars ($100).

Some jurisdictions don't allow the exclusion or limitation of certain damages. In those jurisdictions, our liability is limited to the maximum extent permitted by law.

11. Indemnification

You agree to indemnify and hold harmless Pier39, its officers, employees, and contractors from claims, damages, losses, or expenses (including reasonable attorney fees) arising from your misuse of the service, your violation of these terms, or your violation of any law or third-party right.

12. Termination

You may stop using the service at any time. Pier39 may suspend or terminate your access to the service at any time for violations of these terms or for operational reasons.

The provisions of these terms that by their nature should survive termination — intellectual property, no-warranty, limitation of liability, indemnification, governing law — will survive.

13. Governing law

These terms are governed by the laws of the State of California, without regard to conflict-of-law principles. Any dispute arising from these terms or your use of the service will be resolved in the state or federal courts located in San Francisco County, California, and you consent to the personal jurisdiction of those courts.

14. Changes to these terms

Pier39 may update these terms from time to time. Material changes will be reflected in the "Last updated" date at the top of this page and announced via GitHub release notes for negotiate-mcp and the Pier39 blog.

Continued use of the service after changes take effect constitutes your acceptance of the revised terms. If you don't agree to the revised terms, your remedy is to stop using the service.

15. Contact

For questions about these terms, email sanjana@pier39.ai or open an issue at github.com/sanjana-pier39/pier39-skills/issues.

Summary in one paragraph

By using Pier39's negotiate.v1 stack, you agree: don't abuse the service, don't try to game it, don't blame us if a merchant doesn't honor a negotiation. Agreements reached are between you and the merchant; we're just the protocol layer. We don't process payments and we're not liable for indirect damages. The whole thing is open source. If you have questions, email sanjana@pier39.ai.